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From: Wu Fengguang <wfg@mail.ustc.edu.cn>
To: Con Kolivas <kernel@kolivas.org>,
	linux list <linux-kernel@vger.kernel.org>,
	ck list <ck@vds.kolivas.org>
Subject: Re: [ck] 2.6.16-ck1
Date: Thu, 23 Mar 2006 21:14:39 +0800	[thread overview]
Message-ID: <20060323131439.GA4700@mail.ustc.edu.cn> (raw)
In-Reply-To: <20060323113118.GA9329@spherenet.spherevision.org>

Hi Rodney,

Thanks for your testing :)

On Thu, Mar 23, 2006 at 05:31:18AM -0600, Rodney Gordon II wrote:
> Adaptive readahead: I had probs with this before, and I still do.. On
> a desktop if you have odd problems (nothing responding for SECONDS,
> very slow disk I/O during heavy I/O, etc..) disable it.

Your problem on I/O latency with ara can be tracked down with the help
of Ingo's latency tracing patch. It goes like this:

1) download
http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.16.tar.bz2
http://www.vanheusden.com/ara/adaptive-readahead-11-2.6.16-rc6.patch.gz
http://people.redhat.com/mingo/latency-tracing-patches/latency-tracing-v2.6.16.patch

2)
tar jxf linux-2.6.16.tar.bz2
gunzip adaptive-readahead-11-2.6.16-rc6.patch.gz
cd linux-2.6.16
patch -p1 < ../adaptive-readahead-11-2.6.16-rc6.patch
patch -p1 < ../latency-tracing-v2.6.16.patch

3) compile kernel with Adaptive readahead support
4) boot with the new kernel, and run
echo 0 > /proc/sys/kernel/preempt_max_latency
5) feel some latency problems
6) report the content of /proc/latency_trace

Thanks,
Wu

  parent reply	other threads:[~2006-03-23 13:06 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-03-20 10:45 2.6.16-ck1 Con Kolivas
     [not found] ` <3aa654a40603200300r28034d9di86ed58107d245f08@mail.gmail.com>
2006-03-20 11:39   ` [ck] 2.6.16-ck1 Hugo Vanwoerkom
2006-03-23 11:31 ` Rodney Gordon II
2006-03-23 11:40   ` Con Kolivas
2006-03-23 12:00     ` Rodney Gordon II
2006-03-23 12:37     ` Matt Heler
2006-03-23 13:14   ` Wu Fengguang [this message]
2006-03-23 13:21     ` Rodney Gordon II
     [not found]   ` <dvv0ob$nql$1@sea.gmane.org>
2006-03-23 22:31     ` Stephen Hassard
2006-03-24  6:58       ` 2.6.16-ck1 Edouard Gomez
2006-03-25 18:03         ` [ck] 2.6.16-ck1 Rodney Gordon II

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